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9961 (1991 XK)
Classification: Main-belt Asteroid          SPK-ID: 2009961
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .105400399380993 7.1216e-08  
a 2.240789606934164 1.3787e-08 AU
q 2.004609487434525 1.5443e-07 AU
i 4.856188678680938 7.0845e-06 deg
node 239.9797928792053 6.832e-05 deg
peri 290.7918204026166 7.6509e-05 deg
M 218.3145765332907 3.7428e-05 deg
tp 2457482.695020128775
(2016-Apr-04.19502013)
0.00012995 JED
period 1225.180424344401
3.35
1.1308e-05
3.096e-08
d
yr
n .2938342735867963 2.7119e-09 deg/d
Q 2.476969726433803 1.5241e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      995  
   data-arc span      14141 days (38.72 yr)  
   first obs. used      1976-05-02  
   last obs. used      2015-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52407  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Feb-04 13:27:40  

Additional Information
 Earth MOID = 1.01689 AU 
 T_jup = 3.623 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3 mag n/a MPO319209  

9961 (1991 XK)          Discovered 1991-Dec-04 by Ueda, S., Kaneda, H. at Kushiro (399)
Reference: 19990202/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1991 XK = 1976 JT = 1989 BP 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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